customtabs: Convert to the new AIDL interface, temporarily imported.

chrome/android/java/src/android/support/customtabs/ICustomTabsCallback.aidl

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package android.support.customtabs;
+
+import android.net.Uri;
+import android.os.Bundle;
+
+/**
+ * Interface to a CustomTabsCallback.
+ * @hide
+ */
+oneway interface ICustomTabsCallback {
+    void onUserNavigationStarted(in Uri url, in Bundle extras) = 1;
+    void onUserNavigationFinished(in Uri url, in Bundle extras) = 2;
+}